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Today's Topics:
1. Re: Ground Screens - Another Small Space Option (ZR)
2. Re: W5UN this morning (Tuesday 25th September) - long
pathinto EI? (Lennart M)
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Message: 1
Date: Wed, 26 Sep 2012 09:29:27 -0400
From: "ZR" <zr@jeremy.mv.com>
To: "Paul Christensen" <w9ac@arrl.net>, <topband@contesting.com>
Subject: Re: Topband: Ground Screens - Another Small Space Option
Message-ID: <1BE45301D74240A7A943F879818370FF@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
I've used screens when I needed a wide bandwidth ground system, but never
under other conditions.
Adding a screen or preferably, additional short radials at the base will
assist in stabilizing the resistance component of the vertical radiator
and capacitance across the base insulator as ground conditions change due
to wx, seasonal ground moisture, etc. The stabilization effect is
probably more important with directional systems than it is for
non-directional radiators and is common in AM broadcast systems where an
array is sited in a flood plane.
Paul, W9AC
A screen will result in much stronger radiated power where it is wanted if
the antenna of any height is over poor ground.
Carl
KM1H
------------------------------
Message: 2
Date: Wed, 26 Sep 2012 16:46:19 +0200
From: "Lennart M" <lennart.michaelsson@telia.com>
To: "'Cormac Gebruers'" <ei4hq.mail@gmail.com>,
<topband@contesting.com>
Subject: Re: Topband: W5UN this morning (Tuesday 25th September) -
long pathinto EI?
Message-ID: <DF7444465C6546CE9042C3B1F3E1AFCB@lennartDator>
Content-Type: text/plain; charset="us-ascii"
Hi,
I was up early this morning (Tuesday 25th September) and heard W5UN come up
on 160m at 0444utc. Though very weak and with deep QSB, he was by far and
away the strongest on my K9AY when switched NE and next strongest when
switched SE. I'm in IO51, he is in EM19; direct bearing is 296 degrees
(WNW), long path is 116 degrees (SSE).
I tried calling (as did a few others) but I think perhaps only SM7BIC worked
him. I'm not sure though as condx from my perspective were very marginal
becuase of the deep QSB.
Local sunrise was at 0625utc today
Was he really long path (33428km) or is some other propagation mechanism at
play here?
GE all,
Never worked Dave this morning. Dave was on the chat and called me but we
both had high QRN. Maybe better tmw?
Anyway good to see increasing activity again.
73
Len SM7BIC
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Subject: Digest Footer
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End of Topband Digest, Vol 117, Issue 47
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